feat: 视频阶段诊断增强 + 新账号 product_viral_factory + 执黑先行提示词更新

- phase-videos.js: 增加 item 不符合条件时的逐项诊断日志，明确 confirmed 校验
- pipeline-utils.js: saveManifest 先直写，EPERM 时回退 tmp+rename
- 执黑先行: 分镜/图片/视频提示词完善
- 新增 product_viral_factory 账号（PPT产品宣传片方向）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.claude/skills/video-from-script/scripts/lib/phase-videos.js

@@ -3,6 +3,8 @@
  *
  * 图生视频，批量提交，生成后自动上传 OSS
  * 支持 task ID 恢复：中断后重跑时优先恢复已有任务
+ *
+ * ⚠️注意：items 必须 confirmed=true 才能进入视频生成阶段
  */
 
 const fs = require('fs')
@@ -27,6 +29,25 @@ async function phaseVideos(manifest, manifestPath, options) {
     if (['done', 'pending', 'failed'].includes(it.status)) return true
     return false
   })
+
+  if (videoCandidates.length === 0) {
+    console.log("\n⚠️  [videos] 没有符合条件的 item 进入视频生成阶段")
+    console.log("   manifest 中共有", manifest.items.length, "个 item，逐一诊断:")
+    for (const it of manifest.items) {
+      const reasons = []
+      if (it.confirmed === false) reasons.push("confirmed=false")
+      if (!it.url) reasons.push("缺少 url（图片未上传）")
+      if (!it.videoPrompt) reasons.push("缺少 videoPrompt")
+      if (it.confirmed !== false && it.url && it.videoPrompt && !["done","pending","failed"].includes(it.status)) {
+        reasons.push("status=" + (it.status || "undefined") + "（不在 done/pending/failed 中）")
+      }
+      console.log("   - item", it.id || manifest.items.indexOf(it), ":", reasons.length > 0 ? reasons.join(", ") : "已满足全部条件（不应在此）")
+    }
+    console.log("\n   修复命令:")
+    console.log("   node .claude/skills/video-from-script/scripts/pipeline.js confirm --manifest", manifestPath, "--all")
+    console.log()
+  }
+
   // 对重试 item 自动清理旧视频引用，无需 agent 手动删除
   const items = []
   for (const it of videoCandidates) {

.claude/skills/video-from-script/scripts/lib/pipeline-utils.js

@@ -27,9 +27,16 @@ function loadManifest(manifestPath) {
 }
 
 function saveManifest(manifestPath, manifest) {
-  const tmp = manifestPath + '.tmp'
-  fs.writeFileSync(tmp, JSON.stringify(manifest, null, 2), 'utf-8')
-  fs.renameSync(tmp, manifestPath)
+  try {
+    fs.writeFileSync(manifestPath, JSON.stringify(manifest, null, 2), 'utf-8')
+  } catch (err) {
+    if (err.code === 'EPERM') {
+      // rename/tmp fallback on EPERM
+      const tmp = manifestPath + '.tmp'
+      fs.writeFileSync(tmp, JSON.stringify(manifest, null, 2), 'utf-8')
+      try { fs.renameSync(tmp, manifestPath) } catch (_) {}
+    }
+  }
 }
 
 function loadAccountConfig(accountId) {